CN202549958U - Double-membrane lithium ion battery - Google Patents
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- CN202549958U CN202549958U CN2011204224802U CN201120422480U CN202549958U CN 202549958 U CN202549958 U CN 202549958U CN 2011204224802 U CN2011204224802 U CN 2011204224802U CN 201120422480 U CN201120422480 U CN 201120422480U CN 202549958 U CN202549958 U CN 202549958U
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Abstract
A double-membrane lithium ion battery comprises a positive plate, a negative plate, a double-membrane arranged between the positive plate and the negative plate, organic electrolyte and a packaging shell, wherein one layer of the double membrane is a layer of polyolefin micro-porous membrane, and the other layer of the double membrane is a layer of high temperature resisting cloth. The thickness of the double membrane is 26-60 micrometers, the thickness of the polyolefin micro-porous membrane is 16-25 micrometers, and the thickness of the heat resisting cloth is 10-35 micrometers. The melting point of the high temperature resisting cloth is higher than that of the polyolefin micro-porous membrane. The melting difference between the two membranes is large so as to balance hole closing and skeleton maintaining. The polyolefin micro-porous membrane has a lower hole closing temperature, and the high temperature resisting cloth has a higher melting rupturing temperature, and therefore capability of preventing the battery thermal runaway is strengthened. The high temperature resisting cloth is strong in liquid-imbibing and liquid-preserving capability, and therefore recycling life is prolonged. Both of the high temperature resisting cloth and the double-membrane thinner micro-porous are low in cost. The double-membrane lithium ion battery can reduce adverse low-voltage batteries, self-discharging and self-heating, and improves safety and reliability of the lithium ion battery.
Description
Technical field
A kind of pair of barrier film lithium ion battery of the utility model belongs to field of batteries, particularly relates to a kind of power-type lithium ion battery that possesses high security.
Background technology
Lithium ion battery mainly uses single barrier film at present; From seeing in appearance is single barrier film; Structure has seen that monofilm, three layers of composite membrane, face coats handle composite membrane internally; PE (polyethylene), PP (polypropylene), PP-PE-PP (polypropylene-polyethylene-polypropylene), P (VDF-HFP) (Kynoar-hexafluoropropylene copolymer), PVDF (Kynoar), PTFE (polytetrafluoroethylene), PAN-PE-PAN (polyacrylonitrile-polyethylene-polypropylene nitrile), PET-PE-PET (PETG-polyethylene-PETG), PVDF-PE-PVDF (Kynoar-polyethylene-Kynoar), PTFE-PE-PTFE (polytetrafluoroethylene-polyethylene-polytetrafluoroethylene), TPX-PE-TPX ((poly(4-methyl-1-pentene))-polyethylene-(poly(4-methyl-1-pentene))) microporous barrier, ceramic membrane etc. are specifically arranged; Shiploads of merchandiseization is first three now; Classify as MIcroporous polyolefin film; Indivedual producers utilize its own technology on these three kinds of barrier films, to do various face coats processing so that electrolyte gelization perhaps improves security performance, and these barrier films are regarded as single barrier film at this.This paper connects with "-" expression and is compound, to connect material be one.This paper is adjacent and isolation with "/" expression, and the material that connects is not an one.These barrier films have pluses and minuses separately:
The PE microporous barrier comprises MULTILAYER COMPOSITE PE microporous barrier, shiploads of merchandiseization, and the fusion closed pore temperature is lower, and fail safe is high than the PP microporous barrier, is widely used in the small-scale lithium ion cell.In the large-sized power lithium ion battery, the battery storage energy is big, and when thermal runaway took place, diaphragm closed pore can not stop temperature to rise, and arrives the barrier film melt temperature, security incident occurs.
The PP microporous barrier comprises MULTILAYER COMPOSITE PP microporous barrier, shiploads of merchandiseization, and the fusion closed pore temperature is higher, and near the fusing point of lithium, negative electrode active is high under this temperature, and reaction is fierce, and thermal runaway can take place, and fail safe descends.
The PP-PE-PP microporous barrier, shiploads of merchandiseization in conjunction with PE and PP advantage separately, is widely used in the middle-size and small-size lithium ion battery.PE and PP fusing point differ less.
P (VDF-HFP) microporous barrier is generally self-control and uses by oneself, and once is used for commercial polymer Li-ion battery, and manufacturing cost is high, and the battery drain ratio is high, few at present using.
The PVDF microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.Closed pore temperature is higher, and near the fusing point of lithium, negative electrode active is high under this temperature, and reaction is fierce, and thermal runaway is dangerous easily.
The PTFE microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.Absorbent is poor; Closed pore temperature is high, reaches more than the fusing point of lithium, and negative electrode active is high under this temperature, and reaction is fierce, and thermal runaway is dangerous easily.
The PAN-PE-PAN microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.PE fusion closed pore temperature is low in order to keep, raising casing play heat resistance designs.
The PET-PE-PET microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.PE fusion closed pore temperature is low in order to keep, raising casing play heat resistance designs.
The PVDF-PE-PVDF microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.PE fusion closed pore temperature is low in order to keep, raising casing play heat resistance designs.
The PTFE-PE-PTFE microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.PE fusion closed pore temperature is low in order to keep, raising casing play heat resistance designs.
The TPX-PE-TPX microporous barrier does not have shiploads of merchandiseization, and indivedual producers use voluntarily.PE fusion closed pore temperature is low in order to keep, raising casing play heat resistance designs.
PE, PP, PP-PE-PP make various face coats and handle, and do not have shiploads of merchandiseization, and indivedual lithium ion battery producers use voluntarily, need the environment of high precision equipment and dried and clean, do existing usefulness at present, are difficult to keeping and transportation, and cost is high, is difficult to widely apply.
The Degussa company of Germany uses in the method for high temperature resistant cloth surface recombination inorganic ceramic oxide coating and makes ceramic diaphragm; Even organic high temperature-resistant cloth fusion; The inorganic ceramic oxide coating still can be separated both positive and negative polarity, prevents internal short-circuit, and theoretically secure property is very high; Just not supply does not in batches obtain the commercialization checking; Cost is very high, and more breakable shortcoming is arranged.
After lithium ion battery was done greatly, the energy of storage was big, and danger heightens, and the MIcroporous polyolefin film of shiploads of merchandiseization is difficult to guarantee the fail safe of battery now.On the PET-PE-PET microporous barrier of new research and development, the Degussa ceramic membrane scheduling theory fine fail safe and reliability are arranged, but implement difficultly, cost is high, does not see large-scale popularization.
The large-sized power lithium ion battery MIcroporous polyolefin films that use 25 ~ 60 micron thick because the intensity of PE or PP is relatively low, are pierced through by burr or dust easily now; Or formation barrier film stain; The stain fecund is born near an anodal side, causes the TV university of battery consumable, the battery pack poor reliability of battery and its composition; Even exist safety problem, electric leakage to generate heat explosion caused or burning.Drawing process is made the barrier film that barrier film is difficult to directly draw thickness more than 30 microns, needs MULTILAYER COMPOSITE to reach the thickening purpose.Multilayer PE or the compound thickening of PP microporous barrier all can increase the cost of barrier film.
MIcroporous polyolefin film imbibition liquid-keeping property is relatively poor, influences electric liquid distribution and electric liquid useful load, thereby influences the long-term cycle life of battery.
The lithium ion battery that uses the MIcroporous polyolefin film of existing supply in batches to produce, there is the hidden danger of electric leakage, heating, burning, blast in the bigger power lithium-ion battery of capacity especially; The individual cell leakage conductance causes battery pack imbalance, poor reliability; Liquid absorption is unfavorable for the battery long circulation life less.
Sum up present difficulty:
1. conventional, direct MIcroporous polyolefin film drawing, 10 ~ 25 microns of thickness, insufficient strength, poor reliability; Be used for power lithium-ion battery, because of battery capacity is big, the pole piece area is big; The pole piece dust increases, and increase the pole piece corner, damages barrier film easily; Cause low pressure electric leakage, spontaneous heating, have potential safety hazard; Closed pore temperature is approaching with broken film temperature, and thermal runaway takes place easily.
2. MIcroporous polyolefin film thickening, 25 ~ 60 microns of thickness, intensity and reliability have increased, and cost is significantly increase also; It is approaching with broken film temperature to remain closed pore temperature, and thermal runaway takes place easily.
3. the MIcroporous polyolefin film that uses now, the imbibition liquid-keeping property is relatively poor, is unfavorable for the power lithium-ion battery long circulation life.
4. various composite diaphragms are not produced supply in enormous quantities except that PE-PE, PP-PP, PP-PE-PP microporous barrier, cost is too high, is difficult to apply.
Be eager to develop under the pressure of the large-sized power lithium ion battery, novel high security, high reliability, barrier film supply are not cheaply gone up, and the utility model provides the method for a solution, design a kind of pair of barrier film lithium ion battery.
Summary of the invention
The purpose of the utility model is to avoid the weak point of prior art, and a kind of high security, high reliability, high imbibition liquid-keeping property, long circulation life, a kind of pair of barrier film lithium ion battery cheaply are provided.
The purpose of the utility model reaches through following measure: a kind of pair of barrier film lithium ion battery comprises positive plate, negative plate and places barrier film, organic electrolyte, pack case between positive plate, the negative plate to form; Barrier film is double-deck barrier film, and one deck is a MIcroporous polyolefin film, and one deck is high temperature resistant cloth; Thick 26 ~ 60 microns altogether in double-deck barrier film; 16 ~ 25 microns of polyolefin micropore thickness, thick 10 ~ 35 microns of high temperature resistant cloth, the fusing point of high temperature resistant cloth is higher than polyacrylic fusing point.
The positive plate of the utility model, MIcroporous polyolefin film, high temperature resistant cloth and negative plate are reeled or lamination becomes electric core.
The positive plate of the utility model, high temperature resistant cloth, MIcroporous polyolefin film and negative plate are reeled or lamination becomes electric core.
Positive plate uses known method to make lithium ion cell positive.Positive electrode is cobalt acid lithium, LiMn2O4, lithium nickelate, nickel manganese cobalt acid lithium, LiFePO4, lithium manganese phosphate, iron manganese phosphate for lithium, phosphoric acid vanadium lithium, phosphorofluoric acid lithium iron oxide, one kind of or two or more mixtures.With active material with process mixing paste after conductive agent, bonding agent, solvent fully mix by a certain percentage; Be coated on the aluminum foil current collector through methods such as roller coat, blade coating or sprayings, reserve blank position and be used for soldering polar ear, then drying and roll-in; Itemize or punching make positive plate.
Negative plate uses known method to make lithium ion battery negative.Negative material is native graphite, Delanium, composite graphite, hard carbon, coke, carbonaceous mesophase spherules, carbon fiber, Graphene, lithium titanate, vanadium oxide lithium, silicon, tin oxide, one kind of or two or more mixtures.With active material with process mixing paste after conductive agent, bonding agent, solvent fully mix by a certain percentage; Be coated on the Copper Foil collector through methods such as roller coat, blade coating or sprayings, reserve blank position and be used for soldering polar ear, then drying and roll-in; Itemize or punching make negative plate.
Double-deck barrier film: one deck is a MIcroporous polyolefin film, the MIcroporous polyolefin film that uses 16 ~ 25 the most conventional micron thick as lithium ion see through, the both positive and negative polarity dust is isolated, hot closed pore functional membrane; One deck is high temperature resistant cloth, and the high temperature resistant cloth that uses 10 ~ 35 micron thick is as high strength, heat-resisting isolation features film, and the two is used; Form the double-deck barrier film of total thickness 26 ~ 60 micron thick, to high temperature resistant cloth fusion rupture of membranes, 50 ~ 370 ℃ the temperature difference is arranged from the MIcroporous polyolefin film closed pore; There are long time and bigger thermal capacitance space to suppress battery and continue heating; The assurance lithium ion battery plus-negative plate is isolated, and prevents thermal runaway, ensures lithium ion battery safety.High temperature resistant cloth refers to that fusing point is higher than the high temperature resistant cloth of polymer of polypropylene fusing point; Can be but be not limited to PET (PETG) or PBT (polybutylene terephthalate (PBT)) or PAN (polyacrylonitrile) or PEN (PEN) or PI (polyimides) or the high temperature resistant cloth of aramid fiber; Can be that single material also can be a composite; Perhaps contain high temperature resistant cloth material, the high temperature resistant cloth that low-cost fibers such as blending such as PP are done.130 ~ 145 ℃ of the closed pore temperatures of PE microporous barrier, 160 ~ 175 ℃ of the closed pore temperatures of PP microporous barrier, 258 ℃ of PET is high temperature resistant cloth fusing points; 225 ℃ of PBT is high temperature resistant cloth fusing points; 260 ℃ of PAN is high temperature resistant cloth fusing points, 265 ℃ of PEN is high temperature resistant cloth fusing points, PI is high temperature resistant cloth fusing point is more than 500 ℃; Aramid fiber 1313 is high temperature resistant cloth fusing point is more than 400 ℃, and Fanglun l414 is high temperature resistant cloth fusing point is more than 480 ℃.In order to realize better absorbent or higher purposes such as fail safe, used double-deck barrier film can one of them layer or double-deck through or without oven dry or face coat or corona or eliminate static or chemical treatment or blending inorganic filler.
PET or PBT or PAN or PEN or PI or aramid fiber molecular polarity are strong than PE or PP, soak into easily, absorb, keep electrolyte, help the long-term cycle life of lithium ion battery.
Positive plate, MIcroporous polyolefin film, high temperature resistant cloth and negative plate coiling or lamination are become electric core.
Reel or the order of lamination for first kind: positive plate/MIcroporous polyolefin film/high temperature resistant cloth/negative plate.Preferred this order of using.
Reel or the order of lamination for second kind: positive plate/high temperature resistant cloth/MIcroporous polyolefin film/negative plate.This order of alternative use.
Lithium ion battery plus-negative plate all is that the active material powder is applied on the collector through sizing mixing, and the phenomenon of cream, shedding all can occur falling, just granular size and what problem.Usually lithium ion cell positive falls cream, shedding is many than negative pole, and MIcroporous polyolefin film can stop that dust passes through, and stops it to put up a bridge and forms the passage of short circuit or micro-short circuit.The order of therefore preferred first kind of coiling or lamination, after anodal particle moved to MIcroporous polyolefin film, what follow was the high temperature resistant cloth of electronic isolation, was difficult for taking place to puncture and form the barrier film stain.If use the order of second kind of coiling or lamination, high temperature resistant cloth hole is big, and anodal particle can pass high temperature resistant cloth, arrives MIcroporous polyolefin film, and what follow is negative plate, possibly take place to puncture and form the barrier film stain, causes the electric leakage of battery low pressure.
Electric core is packed in the battery case, connect anode and cathode terminals.Battery case is cylindrical steel, cylindrical stainless steel case, cylindrical aluminum hull, cylindrical flexible package shell, cylindrical plastic shell, oval box hat, oval stainless steel case, oval aluminum hull, oval flexible package shell, oval plastic housing, square box hat, square stainless steel case, square aluminum hull, square flexible package shell, square plastic casing, annular box hat, annular stainless steel case, annular aluminum hull, annular plastic housing, the annular box hat in side, square ring stainless steel shell, the annular aluminum hull in side, square annular plastics shell, and is one kind of.
The battery vacuum bakeout is dewatered, under dry environment, inject electrolyte, seal.The electrolyte conducting salt can be one or more the mixture in lithium hexafluoro phosphate, LiBF4, lithium perchlorate, the hexafluoroarsenate lithium; Solvent is one or more the mixture in dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, propene carbonate, butyrolactone, the ionic liquid, can also add film for additive, anti-overcharging additive, flame-retardant additive, conductive additive, low temperature additive, high temperature additive etc.
Battery is discharged and recharged, change into, partial volume.
Battery is worn out, checks, obtain electric core finished product.
The beneficial effect of the utility model is:
1. adopt the conventional MIcroporous polyolefin film of one deck, add the high temperature resistant cloth of last layer, intensity increases, and gross thickness can avoid pole piece burr and corner to pierce through, and the battery reliability increases.
2. MIcroporous polyolefin film has lower closed pore temperature, high temperature resistantly is furnished with higher fusion broken film temperature, and the ability of prevention battery thermal runaway strengthens.
3. the high temperature resistant imbibition liquid-keeping property preferably that is furnished with can guarantee that battery is than long circulation life.
4. conventional MIcroporous polyolefin film is relatively cheap, and conventional high temperature resistant cloth (like the high temperature resistant cloth of PET) is also relatively cheap, and a large amount of supplies are all arranged, and total cost is low than the incrassation type MIcroporous polyolefin film.
Double-deck barrier film has bigger fusing point poor, at closed pore with keep and try to achieve balance between the skeleton, uses MIcroporous polyolefin film that lower closed pore temperature is arranged, and uses the high temperature resistant higher fusion broken film temperature that is furnished with, the ability enhancing of prevention battery thermal runaway; High temperature resistant cloth imbibition liquid-keeping property is strong, is beneficial to long circulation life; High temperature resistant cloth cost is lower, and double-deck barrier film is low than thickening type microporous barrier cost.The utility model can reduce the bad battery of low pressure, reduces self discharge, reduces spontaneous heating, improves the fail safe and the reliability of lithium ion battery.
Description of drawings
Fig. 1 is the electric core lamination sketch map of the utility model.
Fig. 2 is the electric core winding structural representation of the utility model.
Embodiment
Below in conjunction with embodiment the utility model is further specified.
Among the figure: 01-MIcroporous polyolefin film, the high temperature resistant cloth of 02-, 03-negative plate, 04-positive plate.
Embodiment 1: stacked, square, flexible package, the two barrier film lithium ion batteries of 11585135 type LiFePO4s.
1. system positive plate: use known method, LiFePO4 is equipped with conductive agent, adhesive, solvent, join cream, positive coating on aluminium foil, oven dry, the reverse side coating, the anodal cutting die punching and shaping of 11585135 types is used in oven dry, and compressing tablet obtains positive plate.
2. system negative plate: use known method, Delanium is equipped with conductive agent, adhesive, solvent, join cream, positive coating on Copper Foil, oven dry, the reverse side coating, 11585135 type negative pole cutting die punching and shapings are used in oven dry, and compressing tablet obtains negative plate.
3. cut out two barrier films: the PE microporous barrier of 20 micron thick is cut into the wide barrier film of 126mm 01, the high temperature resistant cloth of the PET of 15 micron thick is cut into the wide barrier film of 126mm 02, be installed on the unwinding rack.
4. lamination: as shown in Figure 1, the high temperature resistant cloth 02 of PET is placed in alignment on PE microporous barrier 01, puts negative plate 03 at the high temperature resistant cloth of PET, with double-deck barrier film 180
.Fold back, on the PE microporous barrier, put positive plate 04, again with double-deck barrier film 180
In the folding past, so repeatedly, until having folded, anodal 25,26 at negative pole wraps up electric core one circle with double-deck barrier film, with the fixing electric core of fixation adhesive tape.
5. welding electrode ear: will seal anode ear in advance with ultrasonic bonder and be soldered on the positive pole, will seal negative electrode lug in advance and be soldered on the negative pole.
6. dress shell: the electric core behind the welding electrode ear is packed in the preformed flexible package shell into closedtop, side seal.
7. vacuum bakeout: moisture was removed in the following 80 ℃ of bakings of vacuum in 12 hours.
8. fluid injection: under drying condition, inject 60 gram flame retardant type electrolyte, seal up liquid injection port.
9. forming and capacity dividing: battery is filled full with 0.2C, do vacuum two envelopes, the 0.2C discharge, 0.5C fills full, and 0.5C electric discharge recording capacity is qualified greater than 10Ah, and 0.5C fills full.
10. aging: that battery was shelved 7 days at 45 ℃.
11. check: examine the voltage internal resistance entirely, voltage>=3.33V, internal resistance≤6m Ω are qualified.
12. test:
12.1 basic parameter
| Thick mm | Wide mm | High mm | Heavy g | Voltage V | Internal resistance m Ω | Capacity Ah |
| 11.5 | 84.0 | 135.2 | 239.5 | 3.333 | 4.2 | 10.55 |
12.2 loop test: battery charges and discharge with 0.5C and 850 weeks of circulation keeps 93% of initial capacity, and is still underway.
12.3 overcharge test: the battery of empty electric attitude is 3C10V and is overcharged test, does not burn and does not explode.
12.4 short-circuit test: fill full battery and do short-circuit test, lug blows, and electric core does not burn and do not explode.
12.5 nail thorn test: fill full battery and do the test of nail thorn, do not burn and do not explode.
12.6 hot case test: fill full battery and put into baking oven, be warmed up to 150 ℃ and kept 30 minutes, do not burn and do not explode.
12.7 heavy impact: fill full battery and do the heavy impact test, the weight of 10Kg freely drops on the battery from the height apart from battery 1mm, does not burn and does not explode.
12.8 dissect: get the battery after 0.5C charges and discharge 500 weeks of circulation, full charging is dissected, and electric core is moistening, and is anodal no abnormal, and negative pole is evenly golden yellow, and indivedual floating powder are arranged on the PE microporous barrier, do not have barrier film blackout point.
Embodiment 2: takeup type, cylindrical, box hat, the two barrier film lithium ion batteries of 26650 type LiFePO4s.
1. system positive plate: use known method, LiFePO4 is equipped with conductive agent, adhesive, solvent, join cream; Positive coating on aluminium foil, oven dry, reverse side coating; Oven dry, compressing tablet uses the anodal itemize cutter of 26650 types itemize to be shaped; The anode ear of burn-oning in the lug position, lug position positive and negative pastes high temperature gummed tape, obtains positive plate.
2. system negative plate: use known method, Delanium is equipped with conductive agent, adhesive, solvent, join cream; Positive coating on Copper Foil, oven dry, reverse side coating; Oven dry, compressing tablet uses 26650 type negative pole itemize cutter itemizes to be shaped; The negative electrode lug of burn-oning in the lug position, lug position positive and negative pastes high temperature gummed tape, obtains negative plate.
3. cut out two barrier films: the PE microporous barrier of 16 micron thick is cut into the wide barrier film of 60mm 01, the high temperature resistant cloth of the PET of 15 micron thick is cut into the wide barrier film of 60mm 02, be installed on the unwinding rack.
4. reel: as shown in Figure 2, the high temperature resistant cloth 02 of PET is placed in alignment on PE microporous barrier 01, puts negative plate 03 at the high temperature resistant cloth of PET; On negative plate 03, put the high temperature resistant cloth 02 of PET; On the high temperature resistant cloth 02 of PET, put PE microporous barrier 01, on PE microporous barrier 01, put positive plate, reel clockwise; Reeled and wrapped up electric core one circle, with the fixing electric core of fixation adhesive tape with double-deck barrier film.
5. dress shell: the electric core that will spool is packed in the 26650 shaped steel shells, the weldering end, adds the face pad, slot rolling, gluing, weldering lid.
6. vacuum bakeout: moisture was removed in the following 80 ℃ of bakings of vacuum in 12 hours.
7. fluid injection: under drying condition, inject 14 gram plain edition electrolyte, seal.
8. forming and capacity dividing: battery was charged and discharged for 1 week with 0.2C, and 0.5C charges and discharge, and recording capacity is qualified greater than 3000mAh, and 0.5C fills full.
10. aging: that battery was shelved 7 days at 45 ℃.
11. check: examine the voltage internal resistance entirely, voltage>=3.33V, internal resistance≤30m Ω are qualified.
12. test:
12.1 basic parameter
| Diameter mm | High mm | Heavy g | Voltage V | Internal resistance m Ω | Capacity mAh |
| 26.1 | 65.5 | 76.5 | 3.332 | 25 | 3120 |
12.2 loop test: battery charges and discharge with 0.5C and 1050 weeks of circulation keeps 92% of initial capacity, and is still underway.
12.3 overcharge test: the battery of empty electric attitude is 3C10V and is overcharged test, does not burn and does not explode.
12.4 short-circuit test: fill full battery and do short-circuit test, do not burn and do not explode.
12.5 nail thorn test: fill full battery and do the test of nail thorn, do not burn and do not explode.
12.6 hot case test: fill full battery and put into baking oven, be warmed up to 150 ℃ and kept 30 minutes, do not burn and do not explode.
12.7 heavy impact: fill full battery and do the heavy impact test, the weight of 10Kg freely drops on the battery from the height apart from battery 1mm, does not burn and does not explode.
12.8 dissect: get the battery after 0.5C charges and discharge 500 weeks of circulation, full charging is dissected, and electric core is moistening, and is anodal no abnormal, and negative pole is evenly golden yellow, and indivedual floating powder are arranged on the PE microporous barrier, do not have barrier film blackout point.
The method of implementing is not limited to above-mentioned example, as long as two barrier film marrow of use the utility model are reeled or lamination is made two barrier film lithium ion batteries, all belongs to the protection range of the utility model.Such as being bonded into single barrier film with PE microporous barrier and the high temperature resistant cloth of PET are symbolistic, do not have substantial compoundly, still belong to the protection range of the utility model.Perhaps used two barrier film core of lithium ion cell,,, still belonged to the protection range of the utility model to adapt to special use occasion although the face shaping of battery is done various particular design.Be the part blending PP fiber that reduces cost when perhaps customizing high temperature resistant cloth, or the like.
Claims (2)
1. a two barrier film lithium ion battery comprises positive plate, negative plate and places barrier film, organic electrolyte, pack case between positive plate, the negative plate to form, and it is characterized in that barrier film is double-deck barrier film; One deck is a MIcroporous polyolefin film; One deck is high temperature resistant cloth, thick 26 ~ 60 microns altogether in double-deck barrier film, 16 ~ 25 microns of polyolefin micropore thickness; Thick 10 ~ 35 microns of high temperature resistant cloth, the fusing point of high temperature resistant cloth is higher than polyacrylic fusing point.
2. a kind of pair of barrier film lithium ion battery according to claim 1 is characterized in that positive plate, MIcroporous polyolefin film, high temperature resistant cloth and negative plate are reeled or lamination becomes electric core.
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| CN2011204224802U CN202549958U (en) | 2011-10-31 | 2011-10-31 | Double-membrane lithium ion battery |
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| CN2011204224802U CN202549958U (en) | 2011-10-31 | 2011-10-31 | Double-membrane lithium ion battery |
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Address after: 511475, Guangdong, Guangzhou province Nansha District Tung Chung Town fine Lek Village (factory building two) (plant three) Patentee after: Guangzhou FULLRIVER Battery New Technology Co., Ltd. Address before: 511400, No. 22 South Embankment Road, Shiqiao Town, Guangzhou City, Guangdong, Panyu District Patentee before: Guangzhou FULLRIVER Battery New Technology Co., Ltd. |
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